1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
4 #include <linux/acpi.h>
5 #include <linux/delay.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/soundwire/sdw_registers.h>
9 #include <linux/soundwire/sdw.h>
11 #include "sysfs_local.h"
13 static DEFINE_IDA(sdw_ida);
15 static int sdw_get_id(struct sdw_bus *bus)
17 int rc = ida_alloc(&sdw_ida, GFP_KERNEL);
27 * sdw_bus_master_add() - add a bus Master instance
29 * @parent: parent device
30 * @fwnode: firmware node handle
32 * Initializes the bus instance, read properties and create child
35 int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
36 struct fwnode_handle *fwnode)
38 struct sdw_master_prop *prop = NULL;
42 pr_err("SoundWire parent device is not set\n");
46 ret = sdw_get_id(bus);
48 dev_err(parent, "Failed to get bus id\n");
52 ret = sdw_master_device_add(bus, parent, fwnode);
54 dev_err(parent, "Failed to add master device at link %d\n",
60 dev_err(bus->dev, "SoundWire Bus ops are not set\n");
64 if (!bus->compute_params) {
66 "Bandwidth allocation not configured, compute_params no set\n");
70 mutex_init(&bus->msg_lock);
71 mutex_init(&bus->bus_lock);
72 INIT_LIST_HEAD(&bus->slaves);
73 INIT_LIST_HEAD(&bus->m_rt_list);
76 * Initialize multi_link flag
77 * TODO: populate this flag by reading property from FW node
79 bus->multi_link = false;
80 if (bus->ops->read_prop) {
81 ret = bus->ops->read_prop(bus);
84 "Bus read properties failed:%d\n", ret);
89 sdw_bus_debugfs_init(bus);
92 * Device numbers in SoundWire are 0 through 15. Enumeration device
93 * number (0), Broadcast device number (15), Group numbers (12 and
94 * 13) and Master device number (14) are not used for assignment so
95 * mask these and other higher bits.
98 /* Set higher order bits */
99 *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
101 /* Set enumuration device number and broadcast device number */
102 set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
103 set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
105 /* Set group device numbers and master device number */
106 set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
107 set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
108 set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
111 * SDW is an enumerable bus, but devices can be powered off. So,
112 * they won't be able to report as present.
114 * Create Slave devices based on Slaves described in
115 * the respective firmware (ACPI/DT)
117 if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
118 ret = sdw_acpi_find_slaves(bus);
119 else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node)
120 ret = sdw_of_find_slaves(bus);
122 ret = -ENOTSUPP; /* No ACPI/DT so error out */
125 dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
130 * Initialize clock values based on Master properties. The max
131 * frequency is read from max_clk_freq property. Current assumption
132 * is that the bus will start at highest clock frequency when
135 * Default active bank will be 0 as out of reset the Slaves have
136 * to start with bank 0 (Table 40 of Spec)
139 bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR;
140 bus->params.curr_dr_freq = bus->params.max_dr_freq;
141 bus->params.curr_bank = SDW_BANK0;
142 bus->params.next_bank = SDW_BANK1;
146 EXPORT_SYMBOL(sdw_bus_master_add);
148 static int sdw_delete_slave(struct device *dev, void *data)
150 struct sdw_slave *slave = dev_to_sdw_dev(dev);
151 struct sdw_bus *bus = slave->bus;
153 pm_runtime_disable(dev);
155 sdw_slave_debugfs_exit(slave);
157 mutex_lock(&bus->bus_lock);
159 if (slave->dev_num) /* clear dev_num if assigned */
160 clear_bit(slave->dev_num, bus->assigned);
162 list_del_init(&slave->node);
163 mutex_unlock(&bus->bus_lock);
165 device_unregister(dev);
170 * sdw_bus_master_delete() - delete the bus master instance
171 * @bus: bus to be deleted
173 * Remove the instance, delete the child devices.
175 void sdw_bus_master_delete(struct sdw_bus *bus)
177 device_for_each_child(bus->dev, NULL, sdw_delete_slave);
178 sdw_master_device_del(bus);
180 sdw_bus_debugfs_exit(bus);
181 ida_free(&sdw_ida, bus->id);
183 EXPORT_SYMBOL(sdw_bus_master_delete);
189 static inline int find_response_code(enum sdw_command_response resp)
195 case SDW_CMD_IGNORED:
198 case SDW_CMD_TIMEOUT:
206 static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
208 int retry = bus->prop.err_threshold;
209 enum sdw_command_response resp;
212 for (i = 0; i <= retry; i++) {
213 resp = bus->ops->xfer_msg(bus, msg);
214 ret = find_response_code(resp);
216 /* if cmd is ok or ignored return */
217 if (ret == 0 || ret == -ENODATA)
224 static inline int do_transfer_defer(struct sdw_bus *bus,
226 struct sdw_defer *defer)
228 int retry = bus->prop.err_threshold;
229 enum sdw_command_response resp;
233 defer->length = msg->len;
234 init_completion(&defer->complete);
236 for (i = 0; i <= retry; i++) {
237 resp = bus->ops->xfer_msg_defer(bus, msg, defer);
238 ret = find_response_code(resp);
239 /* if cmd is ok or ignored return */
240 if (ret == 0 || ret == -ENODATA)
247 static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
249 int retry = bus->prop.err_threshold;
250 enum sdw_command_response resp;
253 for (i = 0; i <= retry; i++) {
254 resp = bus->ops->reset_page_addr(bus, dev_num);
255 ret = find_response_code(resp);
256 /* if cmd is ok or ignored return */
257 if (ret == 0 || ret == -ENODATA)
264 static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg)
268 ret = do_transfer(bus, msg);
269 if (ret != 0 && ret != -ENODATA)
270 dev_err(bus->dev, "trf on Slave %d failed:%d %s addr %x count %d\n",
272 (msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read",
273 msg->addr, msg->len);
276 sdw_reset_page(bus, msg->dev_num);
282 * sdw_transfer() - Synchronous transfer message to a SDW Slave device
284 * @msg: SDW message to be xfered
286 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
290 mutex_lock(&bus->msg_lock);
292 ret = sdw_transfer_unlocked(bus, msg);
294 mutex_unlock(&bus->msg_lock);
300 * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device
302 * @msg: SDW message to be xfered
303 * @defer: Defer block for signal completion
305 * Caller needs to hold the msg_lock lock while calling this
307 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
308 struct sdw_defer *defer)
312 if (!bus->ops->xfer_msg_defer)
315 ret = do_transfer_defer(bus, msg, defer);
316 if (ret != 0 && ret != -ENODATA)
317 dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
321 sdw_reset_page(bus, msg->dev_num);
326 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
327 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
329 memset(msg, 0, sizeof(*msg));
330 msg->addr = addr; /* addr is 16 bit and truncated here */
332 msg->dev_num = dev_num;
336 if (addr < SDW_REG_NO_PAGE) /* no paging area */
339 if (addr >= SDW_REG_MAX) { /* illegal addr */
340 pr_err("SDW: Invalid address %x passed\n", addr);
344 if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */
345 if (slave && !slave->prop.paging_support)
347 /* no need for else as that will fall-through to paging */
350 /* paging mandatory */
351 if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
352 pr_err("SDW: Invalid device for paging :%d\n", dev_num);
357 pr_err("SDW: No slave for paging addr\n");
361 if (!slave->prop.paging_support) {
363 "address %x needs paging but no support\n", addr);
367 msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr);
368 msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr);
369 msg->addr |= BIT(15);
376 * Read/Write IO functions.
377 * no_pm versions can only be called by the bus, e.g. while enumerating or
378 * handling suspend-resume sequences.
379 * all clients need to use the pm versions
383 sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
388 ret = sdw_fill_msg(&msg, slave, addr, count,
389 slave->dev_num, SDW_MSG_FLAG_READ, val);
393 return sdw_transfer(slave->bus, &msg);
397 sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
402 ret = sdw_fill_msg(&msg, slave, addr, count,
403 slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val);
407 return sdw_transfer(slave->bus, &msg);
410 int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
412 return sdw_nwrite_no_pm(slave, addr, 1, &value);
414 EXPORT_SYMBOL(sdw_write_no_pm);
417 sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr)
423 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
424 SDW_MSG_FLAG_READ, &buf);
428 ret = sdw_transfer(bus, &msg);
436 sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
441 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
442 SDW_MSG_FLAG_WRITE, &value);
446 return sdw_transfer(bus, &msg);
449 int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
455 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
456 SDW_MSG_FLAG_READ, &buf);
460 ret = sdw_transfer_unlocked(bus, &msg);
466 EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
468 int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
473 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
474 SDW_MSG_FLAG_WRITE, &value);
478 return sdw_transfer_unlocked(bus, &msg);
480 EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
482 int sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
487 ret = sdw_nread_no_pm(slave, addr, 1, &buf);
493 EXPORT_SYMBOL(sdw_read_no_pm);
495 int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
499 tmp = sdw_read_no_pm(slave, addr);
503 tmp = (tmp & ~mask) | val;
504 return sdw_write_no_pm(slave, addr, tmp);
506 EXPORT_SYMBOL(sdw_update_no_pm);
508 /* Read-Modify-Write Slave register */
509 int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
513 tmp = sdw_read(slave, addr);
517 tmp = (tmp & ~mask) | val;
518 return sdw_write(slave, addr, tmp);
520 EXPORT_SYMBOL(sdw_update);
523 * sdw_nread() - Read "n" contiguous SDW Slave registers
525 * @addr: Register address
527 * @val: Buffer for values to be read
529 int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
533 ret = pm_runtime_get_sync(&slave->dev);
534 if (ret < 0 && ret != -EACCES) {
535 pm_runtime_put_noidle(&slave->dev);
539 ret = sdw_nread_no_pm(slave, addr, count, val);
541 pm_runtime_mark_last_busy(&slave->dev);
542 pm_runtime_put(&slave->dev);
546 EXPORT_SYMBOL(sdw_nread);
549 * sdw_nwrite() - Write "n" contiguous SDW Slave registers
551 * @addr: Register address
553 * @val: Buffer for values to be written
555 int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
559 ret = pm_runtime_get_sync(&slave->dev);
560 if (ret < 0 && ret != -EACCES) {
561 pm_runtime_put_noidle(&slave->dev);
565 ret = sdw_nwrite_no_pm(slave, addr, count, val);
567 pm_runtime_mark_last_busy(&slave->dev);
568 pm_runtime_put(&slave->dev);
572 EXPORT_SYMBOL(sdw_nwrite);
575 * sdw_read() - Read a SDW Slave register
577 * @addr: Register address
579 int sdw_read(struct sdw_slave *slave, u32 addr)
584 ret = sdw_nread(slave, addr, 1, &buf);
590 EXPORT_SYMBOL(sdw_read);
593 * sdw_write() - Write a SDW Slave register
595 * @addr: Register address
596 * @value: Register value
598 int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
600 return sdw_nwrite(slave, addr, 1, &value);
602 EXPORT_SYMBOL(sdw_write);
608 /* called with bus_lock held */
609 static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
611 struct sdw_slave *slave;
613 list_for_each_entry(slave, &bus->slaves, node) {
614 if (slave->dev_num == i)
621 int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
623 if (slave->id.mfg_id != id.mfg_id ||
624 slave->id.part_id != id.part_id ||
625 slave->id.class_id != id.class_id ||
626 (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
627 slave->id.unique_id != id.unique_id))
632 EXPORT_SYMBOL(sdw_compare_devid);
634 /* called with bus_lock held */
635 static int sdw_get_device_num(struct sdw_slave *slave)
639 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
640 if (bit == SDW_MAX_DEVICES) {
646 * Do not update dev_num in Slave data structure here,
647 * Update once program dev_num is successful
649 set_bit(bit, slave->bus->assigned);
655 static int sdw_assign_device_num(struct sdw_slave *slave)
657 struct sdw_bus *bus = slave->bus;
659 bool new_device = false;
661 /* check first if device number is assigned, if so reuse that */
662 if (!slave->dev_num) {
663 if (!slave->dev_num_sticky) {
664 mutex_lock(&slave->bus->bus_lock);
665 dev_num = sdw_get_device_num(slave);
666 mutex_unlock(&slave->bus->bus_lock);
668 dev_err(bus->dev, "Get dev_num failed: %d\n",
672 slave->dev_num = dev_num;
673 slave->dev_num_sticky = dev_num;
676 slave->dev_num = slave->dev_num_sticky;
682 "Slave already registered, reusing dev_num:%d\n",
685 /* Clear the slave->dev_num to transfer message on device 0 */
686 dev_num = slave->dev_num;
689 ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
691 dev_err(bus->dev, "Program device_num %d failed: %d\n",
696 /* After xfer of msg, restore dev_num */
697 slave->dev_num = slave->dev_num_sticky;
702 void sdw_extract_slave_id(struct sdw_bus *bus,
703 u64 addr, struct sdw_slave_id *id)
705 dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
707 id->sdw_version = SDW_VERSION(addr);
708 id->unique_id = SDW_UNIQUE_ID(addr);
709 id->mfg_id = SDW_MFG_ID(addr);
710 id->part_id = SDW_PART_ID(addr);
711 id->class_id = SDW_CLASS_ID(addr);
714 "SDW Slave class_id 0x%02x, mfg_id 0x%04x, part_id 0x%04x, unique_id 0x%x, version 0x%x\n",
715 id->class_id, id->mfg_id, id->part_id, id->unique_id, id->sdw_version);
717 EXPORT_SYMBOL(sdw_extract_slave_id);
719 static int sdw_program_device_num(struct sdw_bus *bus)
721 u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
722 struct sdw_slave *slave, *_s;
723 struct sdw_slave_id id;
729 /* No Slave, so use raw xfer api */
730 ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
731 SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
736 ret = sdw_transfer(bus, &msg);
737 if (ret == -ENODATA) { /* end of device id reads */
738 dev_dbg(bus->dev, "No more devices to enumerate\n");
743 dev_err(bus->dev, "DEVID read fail:%d\n", ret);
748 * Construct the addr and extract. Cast the higher shift
749 * bits to avoid truncation due to size limit.
751 addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
752 ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
755 sdw_extract_slave_id(bus, addr, &id);
758 /* Now compare with entries */
759 list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
760 if (sdw_compare_devid(slave, id) == 0) {
764 * Assign a new dev_num to this Slave and
765 * not mark it present. It will be marked
766 * present after it reports ATTACHED on new
769 ret = sdw_assign_device_num(slave);
772 "Assign dev_num failed:%d\n",
782 /* TODO: Park this device in Group 13 */
785 * add Slave device even if there is no platform
786 * firmware description. There will be no driver probe
787 * but the user/integration will be able to see the
788 * device, enumeration status and device number in sysfs
790 sdw_slave_add(bus, &id, NULL);
792 dev_err(bus->dev, "Slave Entry not found\n");
798 * Check till error out or retry (count) exhausts.
799 * Device can drop off and rejoin during enumeration
800 * so count till twice the bound.
803 } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
808 static void sdw_modify_slave_status(struct sdw_slave *slave,
809 enum sdw_slave_status status)
811 struct sdw_bus *bus = slave->bus;
813 mutex_lock(&bus->bus_lock);
816 "%s: changing status slave %d status %d new status %d\n",
817 __func__, slave->dev_num, slave->status, status);
819 if (status == SDW_SLAVE_UNATTACHED) {
821 "%s: initializing enumeration and init completion for Slave %d\n",
822 __func__, slave->dev_num);
824 init_completion(&slave->enumeration_complete);
825 init_completion(&slave->initialization_complete);
827 } else if ((status == SDW_SLAVE_ATTACHED) &&
828 (slave->status == SDW_SLAVE_UNATTACHED)) {
830 "%s: signaling enumeration completion for Slave %d\n",
831 __func__, slave->dev_num);
833 complete(&slave->enumeration_complete);
835 slave->status = status;
836 mutex_unlock(&bus->bus_lock);
839 static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
840 enum sdw_clk_stop_mode mode,
841 enum sdw_clk_stop_type type)
845 if (slave->ops && slave->ops->clk_stop) {
846 ret = slave->ops->clk_stop(slave, mode, type);
854 static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
855 enum sdw_clk_stop_mode mode,
862 wake_en = slave->prop.wake_capable;
865 val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP;
867 if (mode == SDW_CLK_STOP_MODE1)
868 val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1;
871 val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
873 ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
876 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
880 val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
883 ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
885 if (ret < 0 && ret != -ENODATA)
886 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret);
891 static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
893 int retry = bus->clk_stop_timeout;
897 val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
899 dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
902 val &= SDW_SCP_STAT_CLK_STP_NF;
904 dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n",
909 usleep_range(1000, 1500);
913 dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n",
920 * sdw_bus_prep_clk_stop: prepare Slave(s) for clock stop
922 * @bus: SDW bus instance
924 * Query Slave for clock stop mode and prepare for that mode.
926 int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
928 bool simple_clk_stop = true;
929 struct sdw_slave *slave;
930 bool is_slave = false;
934 * In order to save on transition time, prepare
935 * each Slave and then wait for all Slave(s) to be
936 * prepared for clock stop.
937 * If one of the Slave devices has lost sync and
938 * replies with Command Ignored/-ENODATA, we continue
941 list_for_each_entry(slave, &bus->slaves, node) {
945 if (slave->status != SDW_SLAVE_ATTACHED &&
946 slave->status != SDW_SLAVE_ALERT)
949 /* Identify if Slave(s) are available on Bus */
952 ret = sdw_slave_clk_stop_callback(slave,
954 SDW_CLK_PRE_PREPARE);
955 if (ret < 0 && ret != -ENODATA) {
956 dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret);
960 /* Only prepare a Slave device if needed */
961 if (!slave->prop.simple_clk_stop_capable) {
962 simple_clk_stop = false;
964 ret = sdw_slave_clk_stop_prepare(slave,
967 if (ret < 0 && ret != -ENODATA) {
968 dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret);
974 /* Skip remaining clock stop preparation if no Slave is attached */
979 * Don't wait for all Slaves to be ready if they follow the simple
982 if (!simple_clk_stop) {
983 ret = sdw_bus_wait_for_clk_prep_deprep(bus,
984 SDW_BROADCAST_DEV_NUM);
986 * if there are no Slave devices present and the reply is
987 * Command_Ignored/-ENODATA, we don't need to continue with the
988 * flow and can just return here. The error code is not modified
989 * and its handling left as an exercise for the caller.
995 /* Inform slaves that prep is done */
996 list_for_each_entry(slave, &bus->slaves, node) {
1000 if (slave->status != SDW_SLAVE_ATTACHED &&
1001 slave->status != SDW_SLAVE_ALERT)
1004 ret = sdw_slave_clk_stop_callback(slave,
1006 SDW_CLK_POST_PREPARE);
1008 if (ret < 0 && ret != -ENODATA) {
1009 dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret);
1016 EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
1019 * sdw_bus_clk_stop: stop bus clock
1021 * @bus: SDW bus instance
1023 * After preparing the Slaves for clock stop, stop the clock by broadcasting
1024 * write to SCP_CTRL register.
1026 int sdw_bus_clk_stop(struct sdw_bus *bus)
1031 * broadcast clock stop now, attached Slaves will ACK this,
1032 * unattached will ignore
1034 ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
1035 SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
1037 if (ret != -ENODATA)
1038 dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret);
1044 EXPORT_SYMBOL(sdw_bus_clk_stop);
1047 * sdw_bus_exit_clk_stop: Exit clock stop mode
1049 * @bus: SDW bus instance
1051 * This De-prepares the Slaves by exiting Clock Stop Mode 0. For the Slaves
1052 * exiting Clock Stop Mode 1, they will be de-prepared after they enumerate
1055 int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
1057 bool simple_clk_stop = true;
1058 struct sdw_slave *slave;
1059 bool is_slave = false;
1063 * In order to save on transition time, de-prepare
1064 * each Slave and then wait for all Slave(s) to be
1065 * de-prepared after clock resume.
1067 list_for_each_entry(slave, &bus->slaves, node) {
1068 if (!slave->dev_num)
1071 if (slave->status != SDW_SLAVE_ATTACHED &&
1072 slave->status != SDW_SLAVE_ALERT)
1075 /* Identify if Slave(s) are available on Bus */
1078 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1079 SDW_CLK_PRE_DEPREPARE);
1081 dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret);
1083 /* Only de-prepare a Slave device if needed */
1084 if (!slave->prop.simple_clk_stop_capable) {
1085 simple_clk_stop = false;
1087 ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0,
1091 dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret);
1095 /* Skip remaining clock stop de-preparation if no Slave is attached */
1100 * Don't wait for all Slaves to be ready if they follow the simple
1103 if (!simple_clk_stop) {
1104 ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
1106 dev_warn(&slave->dev, "clock stop deprepare wait failed:%d\n", ret);
1109 list_for_each_entry(slave, &bus->slaves, node) {
1110 if (!slave->dev_num)
1113 if (slave->status != SDW_SLAVE_ATTACHED &&
1114 slave->status != SDW_SLAVE_ALERT)
1117 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1118 SDW_CLK_POST_DEPREPARE);
1120 dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret);
1125 EXPORT_SYMBOL(sdw_bus_exit_clk_stop);
1127 int sdw_configure_dpn_intr(struct sdw_slave *slave,
1128 int port, bool enable, int mask)
1134 if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) {
1135 dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n",
1136 enable ? "on" : "off");
1137 mask |= SDW_DPN_INT_TEST_FAIL;
1140 addr = SDW_DPN_INTMASK(port);
1142 /* Set/Clear port ready interrupt mask */
1145 val |= SDW_DPN_INT_PORT_READY;
1148 val &= ~SDW_DPN_INT_PORT_READY;
1151 ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
1153 dev_err(&slave->dev,
1154 "SDW_DPN_INTMASK write failed:%d\n", val);
1159 static int sdw_slave_set_frequency(struct sdw_slave *slave)
1161 u32 mclk_freq = slave->bus->prop.mclk_freq;
1162 u32 curr_freq = slave->bus->params.curr_dr_freq >> 1;
1169 * frequency base and scale registers are required for SDCA
1170 * devices. They may also be used for 1.2+/non-SDCA devices,
1171 * but we will need a DisCo property to cover this case
1173 if (!slave->id.class_id)
1177 dev_err(&slave->dev,
1178 "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n");
1183 * map base frequency using Table 89 of SoundWire 1.2 spec.
1184 * The order of the tests just follows the specification, this
1185 * is not a selection between possible values or a search for
1186 * the best value but just a mapping. Only one case per platform
1188 * Some BIOS have inconsistent values for mclk_freq but a
1189 * correct root so we force the mclk_freq to avoid variations.
1191 if (!(19200000 % mclk_freq)) {
1192 mclk_freq = 19200000;
1193 base = SDW_SCP_BASE_CLOCK_19200000_HZ;
1194 } else if (!(24000000 % mclk_freq)) {
1195 mclk_freq = 24000000;
1196 base = SDW_SCP_BASE_CLOCK_24000000_HZ;
1197 } else if (!(24576000 % mclk_freq)) {
1198 mclk_freq = 24576000;
1199 base = SDW_SCP_BASE_CLOCK_24576000_HZ;
1200 } else if (!(22579200 % mclk_freq)) {
1201 mclk_freq = 22579200;
1202 base = SDW_SCP_BASE_CLOCK_22579200_HZ;
1203 } else if (!(32000000 % mclk_freq)) {
1204 mclk_freq = 32000000;
1205 base = SDW_SCP_BASE_CLOCK_32000000_HZ;
1207 dev_err(&slave->dev,
1208 "Unsupported clock base, mclk %d\n",
1213 if (mclk_freq % curr_freq) {
1214 dev_err(&slave->dev,
1215 "mclk %d is not multiple of bus curr_freq %d\n",
1216 mclk_freq, curr_freq);
1220 scale = mclk_freq / curr_freq;
1223 * map scale to Table 90 of SoundWire 1.2 spec - and check
1224 * that the scale is a power of two and maximum 64
1226 scale_index = ilog2(scale);
1228 if (BIT(scale_index) != scale || scale_index > 6) {
1229 dev_err(&slave->dev,
1230 "No match found for scale %d, bus mclk %d curr_freq %d\n",
1231 scale, mclk_freq, curr_freq);
1236 ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base);
1238 dev_err(&slave->dev,
1239 "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
1243 /* initialize scale for both banks */
1244 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
1246 dev_err(&slave->dev,
1247 "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
1250 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
1252 dev_err(&slave->dev,
1253 "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
1255 dev_dbg(&slave->dev,
1256 "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n",
1257 base, scale_index, mclk_freq, curr_freq);
1262 static int sdw_initialize_slave(struct sdw_slave *slave)
1264 struct sdw_slave_prop *prop = &slave->prop;
1269 ret = sdw_slave_set_frequency(slave);
1273 if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) {
1274 /* Clear bus clash interrupt before enabling interrupt mask */
1275 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1277 dev_err(&slave->dev,
1278 "SDW_SCP_INT1 (BUS_CLASH) read failed:%d\n", status);
1281 if (status & SDW_SCP_INT1_BUS_CLASH) {
1282 dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n");
1283 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH);
1285 dev_err(&slave->dev,
1286 "SDW_SCP_INT1 (BUS_CLASH) write failed:%d\n", ret);
1291 if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) &&
1292 !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) {
1293 /* Clear parity interrupt before enabling interrupt mask */
1294 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1296 dev_err(&slave->dev,
1297 "SDW_SCP_INT1 (PARITY) read failed:%d\n", status);
1300 if (status & SDW_SCP_INT1_PARITY) {
1301 dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n");
1302 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY);
1304 dev_err(&slave->dev,
1305 "SDW_SCP_INT1 (PARITY) write failed:%d\n", ret);
1312 * Set SCP_INT1_MASK register, typically bus clash and
1313 * implementation-defined interrupt mask. The Parity detection
1314 * may not always be correct on startup so its use is
1315 * device-dependent, it might e.g. only be enabled in
1316 * steady-state after a couple of frames.
1318 val = slave->prop.scp_int1_mask;
1320 /* Enable SCP interrupts */
1321 ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val);
1323 dev_err(&slave->dev,
1324 "SDW_SCP_INTMASK1 write failed:%d\n", ret);
1328 /* No need to continue if DP0 is not present */
1329 if (!slave->prop.dp0_prop)
1332 /* Enable DP0 interrupts */
1333 val = prop->dp0_prop->imp_def_interrupts;
1334 val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
1336 ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val);
1338 dev_err(&slave->dev,
1339 "SDW_DP0_INTMASK read failed:%d\n", ret);
1343 static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
1345 u8 clear, impl_int_mask;
1346 int status, status2, ret, count = 0;
1348 status = sdw_read_no_pm(slave, SDW_DP0_INT);
1350 dev_err(&slave->dev,
1351 "SDW_DP0_INT read failed:%d\n", status);
1356 clear = status & ~SDW_DP0_INTERRUPTS;
1358 if (status & SDW_DP0_INT_TEST_FAIL) {
1359 dev_err(&slave->dev, "Test fail for port 0\n");
1360 clear |= SDW_DP0_INT_TEST_FAIL;
1364 * Assumption: PORT_READY interrupt will be received only for
1365 * ports implementing Channel Prepare state machine (CP_SM)
1368 if (status & SDW_DP0_INT_PORT_READY) {
1369 complete(&slave->port_ready[0]);
1370 clear |= SDW_DP0_INT_PORT_READY;
1373 if (status & SDW_DP0_INT_BRA_FAILURE) {
1374 dev_err(&slave->dev, "BRA failed\n");
1375 clear |= SDW_DP0_INT_BRA_FAILURE;
1378 impl_int_mask = SDW_DP0_INT_IMPDEF1 |
1379 SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
1381 if (status & impl_int_mask) {
1382 clear |= impl_int_mask;
1383 *slave_status = clear;
1386 /* clear the interrupts but don't touch reserved and SDCA_CASCADE fields */
1387 ret = sdw_write_no_pm(slave, SDW_DP0_INT, clear);
1389 dev_err(&slave->dev,
1390 "SDW_DP0_INT write failed:%d\n", ret);
1394 /* Read DP0 interrupt again */
1395 status2 = sdw_read_no_pm(slave, SDW_DP0_INT);
1397 dev_err(&slave->dev,
1398 "SDW_DP0_INT read failed:%d\n", status2);
1401 /* filter to limit loop to interrupts identified in the first status read */
1406 /* we can get alerts while processing so keep retrying */
1407 } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1409 if (count == SDW_READ_INTR_CLEAR_RETRY)
1410 dev_warn(&slave->dev, "Reached MAX_RETRY on DP0 read\n");
1415 static int sdw_handle_port_interrupt(struct sdw_slave *slave,
1416 int port, u8 *slave_status)
1418 u8 clear, impl_int_mask;
1419 int status, status2, ret, count = 0;
1423 return sdw_handle_dp0_interrupt(slave, slave_status);
1425 addr = SDW_DPN_INT(port);
1426 status = sdw_read_no_pm(slave, addr);
1428 dev_err(&slave->dev,
1429 "SDW_DPN_INT read failed:%d\n", status);
1435 clear = status & ~SDW_DPN_INTERRUPTS;
1437 if (status & SDW_DPN_INT_TEST_FAIL) {
1438 dev_err(&slave->dev, "Test fail for port:%d\n", port);
1439 clear |= SDW_DPN_INT_TEST_FAIL;
1443 * Assumption: PORT_READY interrupt will be received only
1444 * for ports implementing CP_SM.
1446 if (status & SDW_DPN_INT_PORT_READY) {
1447 complete(&slave->port_ready[port]);
1448 clear |= SDW_DPN_INT_PORT_READY;
1451 impl_int_mask = SDW_DPN_INT_IMPDEF1 |
1452 SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
1454 if (status & impl_int_mask) {
1455 clear |= impl_int_mask;
1456 *slave_status = clear;
1459 /* clear the interrupt but don't touch reserved fields */
1460 ret = sdw_write_no_pm(slave, addr, clear);
1462 dev_err(&slave->dev,
1463 "SDW_DPN_INT write failed:%d\n", ret);
1467 /* Read DPN interrupt again */
1468 status2 = sdw_read_no_pm(slave, addr);
1470 dev_err(&slave->dev,
1471 "SDW_DPN_INT read failed:%d\n", status2);
1474 /* filter to limit loop to interrupts identified in the first status read */
1479 /* we can get alerts while processing so keep retrying */
1480 } while ((status & SDW_DPN_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1482 if (count == SDW_READ_INTR_CLEAR_RETRY)
1483 dev_warn(&slave->dev, "Reached MAX_RETRY on port read");
1488 static int sdw_handle_slave_alerts(struct sdw_slave *slave)
1490 struct sdw_slave_intr_status slave_intr;
1491 u8 clear = 0, bit, port_status[15] = {0};
1492 int port_num, stat, ret, count = 0;
1495 u8 sdca_cascade = 0;
1496 u8 buf, buf2[2], _buf, _buf2[2];
1500 sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
1502 ret = pm_runtime_get_sync(&slave->dev);
1503 if (ret < 0 && ret != -EACCES) {
1504 dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
1505 pm_runtime_put_noidle(&slave->dev);
1509 /* Read Intstat 1, Intstat 2 and Intstat 3 registers */
1510 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1512 dev_err(&slave->dev,
1513 "SDW_SCP_INT1 read failed:%d\n", ret);
1518 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2);
1520 dev_err(&slave->dev,
1521 "SDW_SCP_INT2/3 read failed:%d\n", ret);
1525 if (slave->prop.is_sdca) {
1526 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1528 dev_err(&slave->dev,
1529 "SDW_DP0_INT read failed:%d\n", ret);
1532 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1536 slave_notify = false;
1539 * Check parity, bus clash and Slave (impl defined)
1542 if (buf & SDW_SCP_INT1_PARITY) {
1543 parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
1544 parity_quirk = !slave->first_interrupt_done &&
1545 (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
1547 if (parity_check && !parity_quirk)
1548 dev_err(&slave->dev, "Parity error detected\n");
1549 clear |= SDW_SCP_INT1_PARITY;
1552 if (buf & SDW_SCP_INT1_BUS_CLASH) {
1553 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
1554 dev_err(&slave->dev, "Bus clash detected\n");
1555 clear |= SDW_SCP_INT1_BUS_CLASH;
1559 * When bus clash or parity errors are detected, such errors
1560 * are unlikely to be recoverable errors.
1561 * TODO: In such scenario, reset bus. Make this configurable
1562 * via sysfs property with bus reset being the default.
1565 if (buf & SDW_SCP_INT1_IMPL_DEF) {
1566 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
1567 dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
1568 slave_notify = true;
1570 clear |= SDW_SCP_INT1_IMPL_DEF;
1573 /* the SDCA interrupts are cleared in the codec driver .interrupt_callback() */
1575 slave_notify = true;
1577 /* Check port 0 - 3 interrupts */
1578 port = buf & SDW_SCP_INT1_PORT0_3;
1580 /* To get port number corresponding to bits, shift it */
1581 port = FIELD_GET(SDW_SCP_INT1_PORT0_3, port);
1582 for_each_set_bit(bit, &port, 8) {
1583 sdw_handle_port_interrupt(slave, bit,
1587 /* Check if cascade 2 interrupt is present */
1588 if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
1589 port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
1590 for_each_set_bit(bit, &port, 8) {
1591 /* scp2 ports start from 4 */
1593 sdw_handle_port_interrupt(slave,
1595 &port_status[port_num]);
1599 /* now check last cascade */
1600 if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
1601 port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
1602 for_each_set_bit(bit, &port, 8) {
1603 /* scp3 ports start from 11 */
1604 port_num = bit + 10;
1605 sdw_handle_port_interrupt(slave,
1607 &port_status[port_num]);
1611 /* Update the Slave driver */
1612 if (slave_notify && slave->ops &&
1613 slave->ops->interrupt_callback) {
1614 slave_intr.sdca_cascade = sdca_cascade;
1615 slave_intr.control_port = clear;
1616 memcpy(slave_intr.port, &port_status,
1617 sizeof(slave_intr.port));
1619 slave->ops->interrupt_callback(slave, &slave_intr);
1623 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, clear);
1625 dev_err(&slave->dev,
1626 "SDW_SCP_INT1 write failed:%d\n", ret);
1630 /* at this point all initial interrupt sources were handled */
1631 slave->first_interrupt_done = true;
1634 * Read status again to ensure no new interrupts arrived
1635 * while servicing interrupts.
1637 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1639 dev_err(&slave->dev,
1640 "SDW_SCP_INT1 recheck read failed:%d\n", ret);
1645 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, _buf2);
1647 dev_err(&slave->dev,
1648 "SDW_SCP_INT2/3 recheck read failed:%d\n", ret);
1652 if (slave->prop.is_sdca) {
1653 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1655 dev_err(&slave->dev,
1656 "SDW_DP0_INT recheck read failed:%d\n", ret);
1659 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1663 * Make sure no interrupts are pending, but filter to limit loop
1664 * to interrupts identified in the first status read
1667 buf2[0] &= _buf2[0];
1668 buf2[1] &= _buf2[1];
1669 stat = buf || buf2[0] || buf2[1] || sdca_cascade;
1672 * Exit loop if Slave is continuously in ALERT state even
1673 * after servicing the interrupt multiple times.
1677 /* we can get alerts while processing so keep retrying */
1678 } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1680 if (count == SDW_READ_INTR_CLEAR_RETRY)
1681 dev_warn(&slave->dev, "Reached MAX_RETRY on alert read\n");
1684 pm_runtime_mark_last_busy(&slave->dev);
1685 pm_runtime_put_autosuspend(&slave->dev);
1690 static int sdw_update_slave_status(struct sdw_slave *slave,
1691 enum sdw_slave_status status)
1695 if (!slave->probed) {
1697 * the slave status update is typically handled in an
1698 * interrupt thread, which can race with the driver
1699 * probe, e.g. when a module needs to be loaded.
1701 * make sure the probe is complete before updating
1704 time = wait_for_completion_timeout(&slave->probe_complete,
1705 msecs_to_jiffies(DEFAULT_PROBE_TIMEOUT));
1707 dev_err(&slave->dev, "Probe not complete, timed out\n");
1712 if (!slave->ops || !slave->ops->update_status)
1715 return slave->ops->update_status(slave, status);
1719 * sdw_handle_slave_status() - Handle Slave status
1720 * @bus: SDW bus instance
1721 * @status: Status for all Slave(s)
1723 int sdw_handle_slave_status(struct sdw_bus *bus,
1724 enum sdw_slave_status status[])
1726 enum sdw_slave_status prev_status;
1727 struct sdw_slave *slave;
1728 bool attached_initializing;
1731 /* first check if any Slaves fell off the bus */
1732 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1733 mutex_lock(&bus->bus_lock);
1734 if (test_bit(i, bus->assigned) == false) {
1735 mutex_unlock(&bus->bus_lock);
1738 mutex_unlock(&bus->bus_lock);
1740 slave = sdw_get_slave(bus, i);
1744 if (status[i] == SDW_SLAVE_UNATTACHED &&
1745 slave->status != SDW_SLAVE_UNATTACHED)
1746 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1749 if (status[0] == SDW_SLAVE_ATTACHED) {
1750 dev_dbg(bus->dev, "Slave attached, programming device number\n");
1751 ret = sdw_program_device_num(bus);
1753 dev_err(bus->dev, "Slave attach failed: %d\n", ret);
1755 * programming a device number will have side effects,
1756 * so we deal with other devices at a later time
1761 /* Continue to check other slave statuses */
1762 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1763 mutex_lock(&bus->bus_lock);
1764 if (test_bit(i, bus->assigned) == false) {
1765 mutex_unlock(&bus->bus_lock);
1768 mutex_unlock(&bus->bus_lock);
1770 slave = sdw_get_slave(bus, i);
1774 attached_initializing = false;
1776 switch (status[i]) {
1777 case SDW_SLAVE_UNATTACHED:
1778 if (slave->status == SDW_SLAVE_UNATTACHED)
1781 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1784 case SDW_SLAVE_ALERT:
1785 ret = sdw_handle_slave_alerts(slave);
1787 dev_err(&slave->dev,
1788 "Slave %d alert handling failed: %d\n",
1792 case SDW_SLAVE_ATTACHED:
1793 if (slave->status == SDW_SLAVE_ATTACHED)
1796 prev_status = slave->status;
1797 sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
1799 if (prev_status == SDW_SLAVE_ALERT)
1802 attached_initializing = true;
1804 ret = sdw_initialize_slave(slave);
1806 dev_err(&slave->dev,
1807 "Slave %d initialization failed: %d\n",
1813 dev_err(&slave->dev, "Invalid slave %d status:%d\n",
1818 ret = sdw_update_slave_status(slave, status[i]);
1820 dev_err(&slave->dev,
1821 "Update Slave status failed:%d\n", ret);
1822 if (attached_initializing) {
1823 dev_dbg(&slave->dev,
1824 "%s: signaling initialization completion for Slave %d\n",
1825 __func__, slave->dev_num);
1827 complete(&slave->initialization_complete);
1833 EXPORT_SYMBOL(sdw_handle_slave_status);
1835 void sdw_clear_slave_status(struct sdw_bus *bus, u32 request)
1837 struct sdw_slave *slave;
1840 /* Check all non-zero devices */
1841 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1842 mutex_lock(&bus->bus_lock);
1843 if (test_bit(i, bus->assigned) == false) {
1844 mutex_unlock(&bus->bus_lock);
1847 mutex_unlock(&bus->bus_lock);
1849 slave = sdw_get_slave(bus, i);
1853 if (slave->status != SDW_SLAVE_UNATTACHED) {
1854 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1855 slave->first_interrupt_done = false;
1858 /* keep track of request, used in pm_runtime resume */
1859 slave->unattach_request = request;
1862 EXPORT_SYMBOL(sdw_clear_slave_status);